Great Stuff Pro Series Lightweight Metal Expanding Foam Foam Gun

The Great Stuff Pro 13 foam dispensing gun is designed to create an airtight and moisture-tight seal between the gun and the can on all Great Stuff Pro series foams. This prevents the foam from curing and blocking the dispensing valve, letting you reuse the can for up to one month. When storing foam, always keep the gun securely attached to the top of the can.